C5 Energy Changes

Question 1

What type of reaction happens if it gains energy

Answer 1

Endothermic

Question 2

What type of reaction happens if it loses energy

Answer 2

Exothermic

Question 3

What type of reaction happens if it’s temperature increases

Answer 3

Exothermic

Question 4

What type of reaction happens if it’s temperature decreases

Answer 4

Endothermic

Question 5

What is the half equation for hydrogen in a hydrogen fuel cell

Answer 5

H2 —> 2H+ + 2e-

Question 6

What is the half equation for oxygen in a hydrogen fuel cell

Answer 6

O^2- + 2e- —> O

Question 7

What is the for a hydrogen fuel cell

Answer 7

O2 + 4H+ + 4e- → 2H2O

Question 8

In a chemical cell ( battery ) the two different metals have to have different what

Answer 8

Reactivity

Question 9

What is the liquid in a chemical cell ( battery ) called

Answer 9

An electrolyte

Question 10

What type of structure is found in electrolytes and why

Answer 10

Ionic as, when molten or in solution, the charged particles can flow